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The aim of this project was to select and study physical solvents which can be employed at low temperature for the treatment of natural gas. These solvents will enable deacidification, dehydratation and removal of liquids to be carried out simultaneously, in a single step, cooling the natural gas on contact with the solvent. Two classes of solvents were considered: heavy solvents that can be regenerated by distillation, a class including N-methylpyrrolidone, dimethylformamide and N-formylmorpholine, and the class of light solvents that can be regenerated by stripping the crude gas; in the latter class only methanol was considered. After an extensive study of the literature, complementary measurements, mainly consisting of equilibrium data, were carried out. In the course of the project, use of heavy solvents was abandoned and attention devoted entirely to methanol, which is plainly the best solvent for the above-mentioned integrated process. Several thermodynamic models were tested on the complex multiphase equilibria involved, including the formation of hydrates at high inhibitor concentrations. Depending on the conditions, some of the more complex models can give good results, but none can represent accurately all the data gathered during this project. Generally, however, the data give sufficient indication that the integrated gas treatment process is thermodynamically viable.

Additional information

Authors: LARUE J, Institut Français du Pétrole, Rueil-Malmaison (FR);LERMITE C, Institut Français du Pétrole, Rueil-Malmaison (FR)
Bibliographic Reference: EUR 13926 EN (1992) 42 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-3699-2
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